Improvement in profiling-machines



E. G. PARKHURST.

Profiling-Machines. No.150253, Patented Aprl28,1874.

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SEE #21 `3 Sheets-Sheet2. E. G. PABKHURST.

Profiling-Machines. N0.]50,253, Patented April 28,1874.

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A E. G. PARKHURST.

Profiling-Machines.

N0'1502'53l Patented Apriv28,l1874.

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UNTTED STATES PATENT OFFICE EDWARD G. PARKHURST, OF HARTFORD, CONN., ASSIGQNOR OF ONE-HALF HIS RIGHT TO THE PRATT 8c WHITNEY COMPANY, OF SAME PLACE.

IMPROVEMENT IN PROFILING-MACHINES.

Sp eciflcation forming part of Letters Patent No. 150,25v, dated April 28,1874; application filed June 28, 1872.

To all whom it may concern:

Be it kn own that I, EDWARD G. PARKHURsT, ofHartford, in the county of Hartford and State of Connecticut, have invented certain new and useful Improvements in Proling-Machines; and I do hereby declare that the following is a full, clear, and exact description thereof, whereby a person skilled. in the art can make and use the same, reference being had to the accompanying drawings and to the letters of reference marked thereon.

Like letters in the figures vindicate the same parts.

My invention consists in the construction and arrangement of certain parts of a protlin gmachine, whereby a former can be cut from a model or pattern while both are lixed upon the bed-plate, and the model removed and duplicates cut from the former exactly similar to the original without turning the bed-plate or in any manner altering the position of the former after it is cut.

In the profiling-machines of ordinary construction the model is xed to the bed-plate, and a former-pin attached to the slide which carries the cutting-tool is held in close contact with it while the cutting-tool passes around the piece to be cut to the same form, likewise lixed to the bed-plate, and makes a former which shall reproduce the given model. Then the bed-plate is turned around one hundred and eighty degrees, so as to change the relative position of the two pieces and bring the former under the forming-pin and the cutter in a position. to cut duplicates as the forming-pin travels around the former. In this operation it is impossible to exactly change the relative position of the pieces, so that inaccuracies will occur which prevent the duplicates from being exactly like the original. To remedy this is the object of my invention.

In the accompanying drawings, on three sheets, Figure 1 is a front view of part of a proling-machine, showing my improvements. Fig. 2 is a back view of the same. Fig. 3 is a view looking downward from a section on the line x y, Figs. l and 2.

a is the fixed frame of the machine. b is the bed-plate, which moves longitudinally upon the slides c c. d is the head or slide which carries the tool and forming-pin. This head moves up and down in grooves in the piece ci e is a sliding block, which moves laterally across the machine on slides of the ordinary construction, forming part of the ixed frame a of the machine. Th us the tool-head l is free to be moved .up or down, or laterally, as may be desired.

a clutch for connecting or disconnecting the pulley lupon the spindle f. Itis shown in the drawings as disconnected. a is a gear-wheel permanently attached to the pulley l, and re volving with it. o is a gear-wheel firmly xed to the spindle g, and turning with it. p is a connecting-gear, running loose on an arbor, s, and communicating motion from u to o when not thrown out of gear. This wheel p is movable up and down upon the arbor s, so that it can be thrown into or out of gear, as desired. The arbor s is made with a shoulder, above which the collar-piece t (also shown in a small detached iigure under Fig. l) is inserted, for the purpose of holding the wheel lo up in the position shown in the drawing. When this piece t is withdrawn the wheel drops down out of gear into the position shown by dotted lines in Fig. l. o and n are then disconnected. q is a set-screw for clamping the spindle f and preventing it from turning, when desired. r is a clamp-nut on the spindle g for the same purpose. a is the model or pattern. c is the former cut upon it. zo isa pin for holding the toolhead at any desired height. z is a rack attached to the piece e. This rack is operated by a pinion of special construction for the purpose of taking up all lost motion when its revolution is reversed. The pinion is composed of "two parts, c2 and b2, which, together, form the proper thickness for gearing into the rack z. The part b2 has two studs or projections, c2 d2,

which pass through openings in the part c2,

and in which they have a circular play for a small distance. Small set-screws szpass through these studs and rest against the wheel c2 in such a manner that the two wheels are firmly held from turning one upon the other, but can be adjusted by turning` the screws so as to separate the cogs of one part of the pinion from those of the other part and completely ll the spaces in the rack, and leave no play or lost motion when the motion of the pinion is reversed. r)She openings in the part a2 are of such a form that the set-screws can be easily operated without removing any parts of the pinion from the machine. My improved piniorris intended to be adapted to the rack giving the longitudinal movement to the bed-plate b, as well as to that giving the lateral movement to the block c.

The operation of my invention is as follows: When it is desired to cut a former to any desired pattern the model is firmly attached to the bedplate at u, and the piece from which the former is to be cut is attached to the bedplate at e. The former-pin is placed in the spindle if and the cutter in the spindle g. rlhe clutch m is disconnected and the spindle f clamped by the set-screw q. The. gears n and o are connected by gear'wheel p, and the spindle g allowed to turn freely. Motion being now communicated to the pulley l the tool h revolves rapidly. The forming-pin is then passed around the edge of the model by means of the longitudinal motion of the bed-plate b and the lateral motion of the block e, and the tool h cuts its exact form at e. To reproduce the model u the forming-pin i and the tool h are changed. The clutch m is connected, so that the pulley shall turn the spindle f. `CLhe screw q is unclamped. The gear p is dropped down out of gear by removing the collar t, and the spindle g is clamped by turning the nut r. The spindle fis now revolved by the pulley l, and when the forming-pin is passed around the former o the exact counterpart of the original model is cut by the tool at u.

It will be observed that the 'whole operation is performed without any possible change in the relative position of the parts, and that an exact reproduction of the original model is assured.

What I claim as my invention is- 1. The two parallel spindles fg, with interchangeable former-pin and cutting-tool, when arranged with intermediate gearing, so that either can be driven by the pulley Z while the other is clamped, and this mechanism is attached to traversing frames which cause the spindles always to move in similar and parallel directions, substantially in the manner described.

2. The combination of the pulley l, the clutch m, the spindle f, the gear-wheels n 0 p, and the spindle g, when constructed and arranged substantially as herein described.

l E. GrPARKHURST.

` llitiiesses:

Timo. G. ELLrs,

BEN. A. COOKE. 

